LKML Archive on lore.kernel.org
 help / color / Atom feed
* [tip: x86/iopl] x86/ioperm: Avoid bitmap allocation if no permissions are set
@ 2019-11-16 11:51 tip-bot2 for Thomas Gleixner
  0 siblings, 0 replies; 2+ messages in thread
From: tip-bot2 for Thomas Gleixner @ 2019-11-16 11:51 UTC (permalink / raw)
  To: linux-tip-commits
  Cc: Thomas Gleixner, Ingo Molnar, Borislav Petkov, linux-kernel

The following commit has been merged into the x86/iopl branch of tip:

Commit-ID:     32f3bf67ee78332f2caec0984cb9d412cd0a3c23
Gitweb:        https://git.kernel.org/tip/32f3bf67ee78332f2caec0984cb9d412cd0a3c23
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Tue, 12 Nov 2019 19:56:19 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 16 Nov 2019 11:24:01 +01:00

x86/ioperm: Avoid bitmap allocation if no permissions are set

If ioperm() is invoked the first time and the @turn_on argument is 0, then
there is no point to allocate a bitmap just to clear permissions which are
not set.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/ioport.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index ca6aa1e..80fa36b 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -36,6 +36,9 @@ long ksys_ioperm(unsigned long from, unsigned long num, int turn_on)
 	 */
 	bitmap = t->io_bitmap_ptr;
 	if (!bitmap) {
+		/* No point to allocate a bitmap just to clear permissions */
+		if (!turn_on)
+			return 0;
 		bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
 		if (!bitmap)
 			return -ENOMEM;

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [patch V3 07/20] x86/ioperm: Avoid bitmap allocation if no permissions are set
@ 2019-11-13 20:42 Thomas Gleixner
  2019-11-15 21:12 ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner
  0 siblings, 1 reply; 2+ messages in thread
From: Thomas Gleixner @ 2019-11-13 20:42 UTC (permalink / raw)
  To: LKML
  Cc: x86, Andy Lutomirski, Linus Torvalds, Stephen Hemminger,
	Willy Tarreau, Juergen Gross, Sean Christopherson,
	H. Peter Anvin

If ioperm() is invoked the first time and the @turn_on argument is 0, then
there is no point to allocate a bitmap just to clear permissions which are
not set.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V3: Split out from large combo patch
---
 arch/x86/kernel/ioport.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -36,6 +36,9 @@ long ksys_ioperm(unsigned long from, uns
 	 */
 	bitmap = t->io_bitmap_ptr;
 	if (!bitmap) {
+		/* No point to allocate a bitmap just to clear permissions */
+		if (!turn_on)
+			return 0;
 		bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
 		if (!bitmap)
 			return -ENOMEM;



^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, back to index

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-16 11:51 [tip: x86/iopl] x86/ioperm: Avoid bitmap allocation if no permissions are set tip-bot2 for Thomas Gleixner
  -- strict thread matches above, loose matches on Subject: below --
2019-11-13 20:42 [patch V3 07/20] " Thomas Gleixner
2019-11-15 21:12 ` [tip: x86/iopl] " tip-bot2 for Thomas Gleixner

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git